Friction Flashcards
1
Q
Friction is
A
A force which acts to oppose motion
2
Q
Friction occurs when
A
When 2 objects rub against eachother
3
Q
When examined under a microscope even a smooth surface may appear
A
rough
4
Q
Friction is often a nuisance, why?
A
Because it converts useful energy into waste energy (e.g.) heat & sound
5
Q
How do people reduce friction on a bowling alley
A
Polish
5
Q
How do people reduce friction on a oil machine
A
Lubricate
6
Q
How do people reduce friction on a hovercraft
A
Seperate with air
7
Q
How do people reduce friction on ball bearings
A
Roll instead of sliding
8
Q
Why do we need friction
A
to ensure our safety, e.g. wheel treads, grips on shoes spikes on boots etc
9
Q
A
